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Have a Sony STR-DE635 that keeps blowing the 2 8 amp fuses in the power supply. disconnected all speakers and powered up with same result. Checked bridge rectifier and (2) 10000 uf caps all are good
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Generally, this indicates that there's at least one shorted output transistor.
Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still blows the fuses, the amp almost certainly has shorted output transistors and will need to be repaired.
I'd recommend using two 10 amp fuses. The amp will power up with 10 amp fuses if there is no problem. If there is a problem, there's less of a chance of doing more damage by using the 10 amp fuses.
Maybe, it worked for me. my rear speakers workt ramdomly, often not. so i re solder the relay for the rear speakers, now it works fine everytime, a hole movie and some random on and offs, it can't do any harme to try=)
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